Tool holder or chuck.



Patented July 27, 1909.

, 2 Wflnwi S w A Fwd. w i k w UNIE ALEXANDER MGGREGOR, OF GLASGOW, SCOTLAND.

TOOL HOLDER OR CHUCK.

Specification of Letters Patent.

. Patented July 27, 1909.

Application filed March 25, 1908. Serial No. 423,105.

T 0 all whom it-ma'y concern.

Be it known that I, ALEXANDER Mc- Gnncon, residing at 8 Jail Square, Glasgow, Scotland, a subject of the King of Great Britain, have invented a certain new and useful Improved Tool Holder or Chuck, of which the following is a specification.

This invention-relates to tool holders or chucks for holding any tool or other articles having either a parallel or tapered end or shank.

Under my invention I provide an improved and simplified tool holder or chuck, comprising toothed jaws, the outside of the jaws being curved or tapered or wedge shaped at both ends. The chuck is arranged within a holder the end or head of which is formed with a wedge shaped or tapered opening which engages with the front tapering end of the chuck jaws. The holder, is also provided with an internally tapered sliding block, nut, or such like, adapted to engage with and compress the back tapering end of the jaws and with a fixed block through which the screwed end of the drill spindle or the like passes so as to bear against the sliding block and thus cause the latter to move up against the tapering end of the chuck jaws. The arrangement is such that the chuck aws will engage and grip the end or shank of the tool or other article whether it is tapered or parallel, this being accomplished by the double wedge or curved formation of the jaws which, in engaging with the tapered front end of the holder and the internally tapered sliding block, are closed so as to grip and hold the tool in position.

If desired the holder may be made so that a nut or the like which is internally tapered or coned can be caused to move on the same and cause the aws to grasp and hold the tool or other article. A suitable means would preferably be provided to keep the jaws of the chuck normally apart, and the teeth on the chuck jaws may be so cut that they will never be completely out of engagement with each other.

In order that my invention may be clearly understood, I have hereunto appended an eX planatory sheet of drawings, whereon:'

Figure 1 is a longitudinal section of the construction of the invention.

tool holder or chuck showing the same screwed on a drillingmachine spindle. Fig. 2 is a plan view, the one half being shown in section. Fig. 3 is an enlarged cross section taken on the line 11 1. Fig. 4 isan enlarged cross section taken on the line 2-2 Fig. 1. Fig.5 is anisometrical perspective View of the internally tapered sliding thrust lock 17,. Fig. 6 shows, in section, a modified Fig. 7 is a planview of Fig. 6. Fig. 8 is a side elevation of the "tool holder or chuckillustrated at Fig. 6. Fig. 9 is an isometrical perspective view of one of the toothed jaws f. Fig. 10 illustrates a modified form of jaw.

The same reference letters wherever re peated indicatethe sameparts.

In carrying out my invention I provide a tool holder or chuck a which as shown at Fig. l is formed with an internally screwed part b by means of which the tool-holder or chuck is secured on the screwed end of the driving spindle b Secured to or made onewith the part Z) aretwo plates cfd, which form a parallel sided guide or framehaving, at the front end thereof, and one therewith, an internally-tapered head or casing c. Slidably fitted between the plates .0, d, are two jaws fig, having their inner faces provided with projections orteethh which are preferably of the form shown at Figs. 9 and 10. The projections 71. on the one jaw are arranged so as to. enter into the spaces 72,1 between the projections on the other jaw, and, at the same time to leave a central diamond shaped passage 2' as shown at Fig. 3 into which the tool, Wire or other article to be held may be inserted. The outer faces y, is, of the jaws f, g, are made curved or tapered (see Figs. 7, 6,, 8, 9 and 10) and are adapted to bear against the internally tapered sides Z, m, of

the head or casing e.

Slidably and removably fitted between the plates 0, d, is a T shaped thrust block a (see Fig. 4) having shoulders n a and at its operating end (see Fig. 5) a tapered recess 0 adapted to engagethe rear end of the curved or tapered faces 7', 7,of the aws f, g. The sliding block a is inserted between the plates 0, d, and is held in'place against play or movement by the shoulders n of, on the one side and two cover pleces or plates 7), p,

which latter are screwed, riveted or otherwise secured at the opposite side (see Fig. to said thrust block n. The inner edges'of the cover plates p, '2), and the shoulders n 72 of the T shaped thrust block nabut against and are guided, during the movements of said block by the plates 0, (Z, which form the parallel guide or frame.

If desired the jaws f, g, of the chuck be normally held apart by flat or plate springs q, two on each side of the blocks,the fixed end of each spring being secured to the part I), while the free end 7 of. each spring engages a pin 3 one securedin each aw, f, g. Instead of plate springs as shown at Figs. 1, 2, and 3 I may use a spiral or coiled spring (such as t Figs. 6 andS) one in each side of the jaws the ends of the springs being inserted in holes a in the aws, or the ends of the springs may be fixed in any other suitable, manner.

If desired the thrust block a may be pro-.

inserted into the handle a or when desired. 7 7 1 the hollow spindle w may be suitably attached to a drillingspindle. The hollow spindle, under this construction, is slotted for a part of its length and into the slot thus formed is inserted the jaws f, g, which have been already described. The hollow spindle w is screwed externally for a part of its length and is provided with a nut y, which, at its front end, is cone shaped internally. By turning the cone-shaped nut y in the desired direct-ion, the said nut may be caused to act on the rear tapered or curved faces 7', 7c, of the jaws 7", 9, thereby causing the jaws to tightly grip the drill shank, wire, or other article, or to release the same (whether the said shank, etc., is tapered or parallel). When this construction is used with a handle, such as a Fig. 6, the latter may be made with a hole g for the reception of a wire 12 or other article which can pass right through the handle, the tube to and the chuck. hen it is desired to give a positive drive to this form of chuck, a plug indicated in dotted lines at 7 /3 Figs. 6 and Shaving a recess g at its outer end, is inserted in and secured at or near the inner end of the hollow spindle 10. If desired the jaws of the chuck may have fitted at each end thereof, projecting shaped ends of the jaws of the chuck forcin may.

plates 71,2 so arranged that the plates on the one jaw will interlock with those of the other aw, and thereby retain the aws in engagement at all times. (See Fig. 10).

hen the holder is in use and the chuck a engages the end or shank of a tool, wire or other article, the sliding block a can be forced by its rotation on the spindle end (b against the rear tapered or wedgeb the jaws forward so that their tapered front ends are compressed by the tapered head (6), in this manner causing the jaws to tightly grip and hold the inserted tool-end or other catch whether the same be tapered or parallel.

The improved chuck may he obviously modified in its details of construction without departing from the invention.

Havingnowfully described my invention, what I claim and desire to secure by Letters Patent is l. A chuck comprising in combination an internally screw-threaded member for engagement with a driving spindle, parallel plates carried by said member and having at their free ends an internally tapered head, jaws slidingly fitted between said plates, a T-shaped thrust block slidably and removably fitted between said plates and having a recess to engage the rear ends of said jaws, and cover plates secured to said thrust block, said thrust, block being formed with shoulders cooperating with the inner edges of said-cover plates to hold the thrust block in position.

2. A chuck comprising in combination an internally screw-threaded member for engagement with a driving spindle, parallel plates carried by said member and having at their free ends an internally tapered head,

'T-shaped thrust block slidably and removably fitted between said plates and having a recess to engage the rear ends of said aws, and cover plates secured to said thrust block, said thrust block being formed with shoulders cooperating with the inner edges of said cover plates to hold the thrust block in po sition, the said jaws being provided with alternately disposed inter-engaging projections constructed to leave a central passage for the reception of the tool.

3. A chuck comprising in combination an internally screw-threaded member for engagement with a driving spindle, parallel plates carried by said member and having at their free ends an internally tapered head, jaws slidingly fitted between said plates, a T-shaped thrust block slidably and removably fitted between said plates and having a recess to engage the rear ends of'said jaws, and cover plates secured to said thrust block, said thrust block being formed with *shoulr tions constructed to leave a central passage for the reception of the tool and at the ends with projecting lnterlocking plates.

In testimony whereof I aliix my signature in presence of two wltnesses.

ALEXANDER MGGREGOR.

lVit-n'esses GEORGE WOLFE BRUCE, ROBERT A. THOMPSON. 

